#include <stdio.h>
#include <string.h>

void del(char *arr_c1, char *arr_c2, int right) {
    int left = 0;
    while (right >= left) {
        arr_c2[left] = arr_c1[left];
        arr_c2[right] = arr_c1[right];
        printf("%s\n", arr_c2);
        left++;
        right--;
    }
}

int main() {
    char arr1[] = "welcome my school";
    char arr2[] = "#################";
    unsigned long len;
    len = strlen(arr2) - 1;
    printf("%lu", len);
    del(arr1, arr2, len);

    return 0;
}